Test Catalog Search Home Test Catalog Search Testing Choices: From the standard to the extraordinary × Search Clear Filter by: Clear all Method(s) High Performance Liquid Chromatography/ Tandem Mass Spectrometry (LC-MS/MS) (2) Sample Type Blood (1) Serum or Plasma (1) Test Area (-) Therapeutics (2) Test Category Immunosuppressants (2) Test Sub-Category (-) Other (2) Test Test Name 2531B Leflunomide as Metabolite (Therapeutic Drug Monitoring), Blood 2531SP Leflunomide as Metabolite (Therapeutic Drug Monitoring), Serum/Plasma